/* 1. ECMAScript 的内置对象 */
let b: Boolean = new Boolean(1)
let n: Number = new Number(true)
let s: String = new String('abc')
let d: Date = new Date()
let r: RegExp = /^1/
let e: Error = new Error('error message')
b = true
// let bb: boolean = new Boolean(2)  // error

const div: HTMLElement = document.getElementById('test')
const divs: NodeList = document.querySelectorAll('div')
document.addEventListener('click', (event: MouseEvent) => {
    console.dir(event.target)
})
const fragment: DocumentFragment = document.createDocumentFragment()
